isFullScreenSupported always true for monitors

问题

Given the following code

 GraphicsDevice screen = GraphicsEnvironment.getLocalGraphicsEnvironment().getScreenDevices()[0];
 if (screen.isFullScreenSupported()) {
      //is it always true for monitors?
 }

Is screen.isFullScreenSupported() always true for monitors?

回答1:

No, it may not be true.

The SecurityManager might disallow you the full screen control. Mainly because one could easily fake whole screen in order to grab a password from not-suspecting user (you could mock a bank website).

It can be false:

• in an applet
• in a WebStart Application
• while running in headless mode

JavaDOC of GraphicsDevice.isFullScreenSupported:

Returns true if this GraphicsDevice supports full-screen exclusive mode. If a SecurityManager is installed, its checkPermission method will be called with AWTPermission("fullScreenExclusive"). isFullScreenSupported returns true only if that permission is granted

来源：https://stackoverflow.com/questions/13351936/isfullscreensupported-always-true-for-monitors